1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/compiler/fast-accessor-assembler.h"
#include "src/base/logging.h"
#include "src/compiler/graph.h"
#include "src/compiler/linkage.h"
#include "src/compiler/pipeline.h"
#include "src/compiler/raw-machine-assembler.h"
#include "src/compiler/schedule.h"
#include "src/compiler/verifier.h"
#include "src/handles-inl.h"
#include "src/objects.h" // For FAA::GetInternalField impl.
namespace v8 {
namespace internal {
namespace compiler {
FastAccessorAssembler::FastAccessorAssembler(Isolate* isolate)
: zone_(),
assembler_(new RawMachineAssembler(
isolate, new (zone()) Graph(zone()),
Linkage::GetJSCallDescriptor(&zone_, false, 1,
CallDescriptor::kNoFlags))),
state_(kBuilding) {}
FastAccessorAssembler::~FastAccessorAssembler() {}
FastAccessorAssembler::ValueId FastAccessorAssembler::IntegerConstant(
int const_value) {
CHECK_EQ(kBuilding, state_);
return FromRaw(assembler_->NumberConstant(const_value));
}
FastAccessorAssembler::ValueId FastAccessorAssembler::GetReceiver() {
CHECK_EQ(kBuilding, state_);
// For JS call descriptor, the receiver is parameter 0. If we use other
// call descriptors, this may or may not hold. So let's check.
CHECK(assembler_->call_descriptor()->IsJSFunctionCall());
return FromRaw(assembler_->Parameter(0));
}
FastAccessorAssembler::ValueId FastAccessorAssembler::LoadInternalField(
ValueId value, int field_no) {
CHECK_EQ(kBuilding, state_);
// Determine the 'value' object's instance type.
Node* object_map =
assembler_->Load(MachineType::Pointer(), FromId(value),
assembler_->IntPtrConstant(
Internals::kHeapObjectMapOffset - kHeapObjectTag));
Node* instance_type = assembler_->WordAnd(
assembler_->Load(
MachineType::Uint16(), object_map,
assembler_->IntPtrConstant(
Internals::kMapInstanceTypeAndBitFieldOffset - kHeapObjectTag)),
assembler_->IntPtrConstant(0xff));
// Check whether we have a proper JSObject.
RawMachineLabel is_jsobject, is_not_jsobject, merge;
assembler_->Branch(
assembler_->WordEqual(
instance_type, assembler_->IntPtrConstant(Internals::kJSObjectType)),
&is_jsobject, &is_not_jsobject);
// JSObject? Then load the internal field field_no.
assembler_->Bind(&is_jsobject);
Node* internal_field = assembler_->Load(
MachineType::Pointer(), FromId(value),
assembler_->IntPtrConstant(JSObject::kHeaderSize - kHeapObjectTag +
kPointerSize * field_no));
assembler_->Goto(&merge);
// No JSObject? Return undefined.
// TODO(vogelheim): Check whether this is the appropriate action, or whether
// the method should take a label instead.
assembler_->Bind(&is_not_jsobject);
Node* fail_value = assembler_->UndefinedConstant();
assembler_->Goto(&merge);
// Return.
assembler_->Bind(&merge);
Node* phi = assembler_->Phi(MachineRepresentation::kTagged, internal_field,
fail_value);
return FromRaw(phi);
}
FastAccessorAssembler::ValueId FastAccessorAssembler::LoadValue(ValueId value,
int offset) {
CHECK_EQ(kBuilding, state_);
return FromRaw(assembler_->Load(MachineType::IntPtr(), FromId(value),
assembler_->IntPtrConstant(offset)));
}
FastAccessorAssembler::ValueId FastAccessorAssembler::LoadObject(ValueId value,
int offset) {
CHECK_EQ(kBuilding, state_);
return FromRaw(
assembler_->Load(MachineType::AnyTagged(),
assembler_->Load(MachineType::Pointer(), FromId(value),
assembler_->IntPtrConstant(offset))));
}
void FastAccessorAssembler::ReturnValue(ValueId value) {
CHECK_EQ(kBuilding, state_);
assembler_->Return(FromId(value));
}
void FastAccessorAssembler::CheckFlagSetOrReturnNull(ValueId value, int mask) {
CHECK_EQ(kBuilding, state_);
RawMachineLabel pass, fail;
assembler_->Branch(
assembler_->Word32Equal(
assembler_->Word32And(FromId(value), assembler_->Int32Constant(mask)),
assembler_->Int32Constant(0)),
&pass, &fail);
assembler_->Bind(&fail);
assembler_->Return(assembler_->NullConstant());
assembler_->Bind(&pass);
}
void FastAccessorAssembler::CheckNotZeroOrReturnNull(ValueId value) {
CHECK_EQ(kBuilding, state_);
RawMachineLabel is_null, not_null;
assembler_->Branch(
assembler_->IntPtrEqual(FromId(value), assembler_->IntPtrConstant(0)),
&is_null, ¬_null);
assembler_->Bind(&is_null);
assembler_->Return(assembler_->NullConstant());
assembler_->Bind(¬_null);
}
FastAccessorAssembler::LabelId FastAccessorAssembler::MakeLabel() {
CHECK_EQ(kBuilding, state_);
RawMachineLabel* label =
new (zone()->New(sizeof(RawMachineLabel))) RawMachineLabel;
return FromRaw(label);
}
void FastAccessorAssembler::SetLabel(LabelId label_id) {
CHECK_EQ(kBuilding, state_);
assembler_->Bind(FromId(label_id));
}
void FastAccessorAssembler::CheckNotZeroOrJump(ValueId value_id,
LabelId label_id) {
CHECK_EQ(kBuilding, state_);
RawMachineLabel pass;
assembler_->Branch(
assembler_->IntPtrEqual(FromId(value_id), assembler_->IntPtrConstant(0)),
&pass, FromId(label_id));
assembler_->Bind(&pass);
}
MaybeHandle<Code> FastAccessorAssembler::Build() {
CHECK_EQ(kBuilding, state_);
// Cleanup: We no longer need this.
nodes_.clear();
labels_.clear();
// Export the schedule and call the compiler.
Schedule* schedule = assembler_->Export();
MaybeHandle<Code> code = Pipeline::GenerateCodeForCodeStub(
assembler_->isolate(), assembler_->call_descriptor(), assembler_->graph(),
schedule, Code::STUB, "FastAccessorAssembler");
// Update state & return.
state_ = !code.is_null() ? kBuilt : kError;
return code;
}
FastAccessorAssembler::ValueId FastAccessorAssembler::FromRaw(Node* node) {
nodes_.push_back(node);
ValueId value = {nodes_.size() - 1};
return value;
}
FastAccessorAssembler::LabelId FastAccessorAssembler::FromRaw(
RawMachineLabel* label) {
labels_.push_back(label);
LabelId label_id = {labels_.size() - 1};
return label_id;
}
Node* FastAccessorAssembler::FromId(ValueId value) const {
CHECK_LT(value.value_id, nodes_.size());
CHECK_NOT_NULL(nodes_.at(value.value_id));
return nodes_.at(value.value_id);
}
RawMachineLabel* FastAccessorAssembler::FromId(LabelId label) const {
CHECK_LT(label.label_id, labels_.size());
CHECK_NOT_NULL(labels_.at(label.label_id));
return labels_.at(label.label_id);
}
} // namespace compiler
} // namespace internal
} // namespace v8
|
